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Table 3 Estimated study power for 500 patients per treatment arm (N = 1,000)

From: Fixation using alternative implants for the treatment of hip fractures (FAITH): design and rationale for a multi-centre randomized trial comparing sliding hip screws and cancellous screws on revision surgery rates and quality of life in the treatment of femoral neck fractures

Baseline risk
(Year 1)^ Relative risk reduction
  10% 15% 20% 25% 30% 35v 40%
15.5% 14.5% 28.5% 48.1% 69.3% 86.3% 95.7% 99.2%
  1. *Number of patients per treatment arm, alpha = 0.05.
  2. ^Year 2 risk is 27.2%.
  3. Bold numbers indicate statistical power range for this study.